Template:Did you know

This is a duplication of Trivia. If you add new trivia please add it to both.

Did you know that since version 1.5 vanilla Doom can play MIDI files directly, and converting them to MUS is therefore useless?

Did you know that Doom's intermission screen shows the Tower of Babel being built during the second episode?

Did you know that the level names in Thy Flesh Consumed, the final episode that was introduced in The Ultimate Doom, are all taken from passages in the of the ?

Did you know that the soul sphere was originally supposed to be an "extra life" powerup, before the concept of lives was dropped during development?

Did you know that the chainsaw and super shotgun weapons in the game were inspired by the  series of movies?

Did you know that the super shotgun blast at close range will do about as much damage as the direct hit of a rocket from a rocket launcher or cyberdemon?

Did you know that several monsters make characteristic sounds while roaming?

Did you know that Doom 3 contains numerous references to classic Doom?

Did you know that Doom contains a shocked status bar face expression which is almost never displayed due to a bug in the game?

Did you know that Doom's automap was originally intended to include a minigame as an Easter egg?

Did you know that the Nightmare! skill level was added as a joke, in response to comments that the game was too easy?

Did you know that Doom Alpha version 0.5 had an old version of MAP10: Refueling Base from Doom II in it?

Did you know that the Doom II map Circle of Death takes its automap name from the "Hoe of Destruction" found in ?

Did you know that the name "Doom" comes from a scene in the movie ?

Did you know that vanilla Doom can be launched with skill level set to 0, which makes levels empty of all monsters, items, and decorations?

Did you know that many sound effects used in the original Doom games were acquired from Sound Ideas' General series sound effects library, which is why they can be heard in various movies and television shows?

Did you know that pain elementals and arch-viles cannot normally be the primary target of another monster?

Did you know that the command line parameter was added to Doom by John Carmack as a prank to allow Shawn Green to beat John Romero in a deathmatch?

Did you know that in vanilla Doom it is possible to render an arch-vile attack harmless by saving and loading the game while the arch-vile is performing the offensive?

Did you know that a bug in the Doom engine allows certain mancubus shots to go through walls?

Did you know that John Romero built the level Perfect Hatred in six hours?

Did you know that arch-viles can, eventually, kill themselves with the splash damage from their own attack?

Did you know that as the development of the game that would eventually become Doom started id Software briefly considered basing it on the movie ?

Did you know that, in Doom versions up to 1.1, it was possible to run the game on three monitors at once, giving a 270-degree field of vision?

Did you know that the command line parameter refers to Austin Virtual Gaming, a shop near the  set up in 1994 for pay-for-play Doom multiplayer?

Did you know that the abbreviation BFG stands for "Big Fucking Gun"?

Did you know that John Carmack went to for trying to steal an  computer when he was a teen?

Did you know that Doom was released one day after a hearing on ?

Did you know that id Software did not release a shareware demo of Doom II?

Did you know that John Romero coined the term "deathmatch" while he and John Carmack were developing Doom's multiplayer mode?

Did you know that the Doom music was based on music by bands including, , , and ?

Did you know that in Doom version 1.0 map E1M4: Command Control contained a swastika-shaped structure?

Did you know that Doom's protagonist, the marine, has made cameo appearances in Duke Nukem 3D and in the PC version of ?

Did you know that id Software coined the initial concept of Quake before developing Doom?

Did you know that while many monsters of the same species will not normally fight each other they may do so if one causes a barrel explosion which hurts another?

Did you know that splash damage in the original Doom games is computed only from the horizontal distance between the explosion and the affected thing, which can be used to harm targets far above or below the blast?

Did you know that in the original Doom games the speed of projectiles does not take the vertical dimension into account? For example, this causes monsters' fireballs to travel extremely fast when fired from above or below.

Did you know that the Wolfenstein SS in the Doom II secret levels MAP31 and MAP32 have a blue uniform, even though actual soldiers had a black one?

Did you know that the graphic lumps for the episodes in Doom menu are still in DOOM2.WAD?

Did you know that the invulnerability powerup not affecting the sky, long thought to be a feature, is actually a bug?

Did you know that in some source ports, it is possible to run Chex Quest with Doom 1 graphics by using DOOM2.WAD as a PWAD?

Did you know that there are two floor lamps near the blue key in E1M3 that deliberately do not appear in Ultra-Violence?

Did you know that Knee-Deep in the Dead contains exactly 100 rockets?

Did you know that the Strife ID badge and ID card have their ingame lock messages transposed?

Did you know that the Doom IWAD contains an unused sprite (SMT2A0), depicting a gray stalagmite?

Did you know that the "idchoppers" cheat code is meant to make the player invulnerable in addition to giving him a chainsaw, but doesn't work properly due to a bug?

Did you know that the lost soul sprite was retouched for Doom 2, but the PlayStation ports of Doom retained the previous version?

Did you know that lost souls can corrupt the map layout in the PlayStation and Sega Saturn versions of Doom if they move outside of the level boundaries?

Did you know that Doom's first level, E1M1: Hangar, was the last level that was made?

Did you know that the Ultimate Doom version of E1M1: Hangar contains exactly sidedefs?

Did you know that E1M2: Nuclear Plant was featured in a Windows 95 promotional video starring ?

Did you know that the Super NES port was developed secretively, before later being approved by id Software?

Did you know that the berserk in Classic Doom lasts for an entire level, even though the red haze only lasts approximately 20 seconds?

Did you know that using certain Doom cheats in Heretic will lead to negative consequences?

Did you know that Doom v0.2 includes the ability to cycle through various textures, where two of them contain Easter eggs - "Jules Sucks", referring to Adrian Carmack, and "Tom is King", referring to Tom Hall?

Did you know that the reason Doom is so moddable is because John Carmack saw a graphics mod for Wolfenstein 3D that changed the first boss to ?

Did you know that in pre-release versions of Doom II, arachnotrons looked more like spiderdemons, complete with a super-chaingun?

Did you know that in the PlayStation and Sega Saturn ports of Hexen, a fly can be found in some areas, despite being absent from the final PC release?

Did you know that WizardWorks released two commercial megawads made by Wraith Corporation, mostly comprised of TeamTNT members?

Did you know that exclusive quit messages were made for the Windows 95 and Macintosh versions of Doom?

Did you know that Final Doom could have had a third megawad?

Did you know that several characters and story elements seen in the Doom Bible were reused by Tom Hall in Rise of the Triad?

Did you know that, despite sharing a last name, John and Adrian Carmack are not related?

Did you know that the majority of levels in Doom and Doom II were designed by Sandy Petersen, a practicing ?

Did you know that John Carmack was sent to juvenile detention after attempting to break into his school computer lab with ?

Did you know that the Doom Bible mentions a cut command line parameter that would turn actors into naked women?

Did you know that there are a total of six officially-licensed games that use the Doom engine (Doom, Doom II, Heretic, Hexen: Beyond Heretic, Strife: Quest for the Sigil, and Chex Quest)?

Did you know that in May of 2019, John Romero released a fifth episode for Doom?

Did you know that Doom was inspired by a game of that ended with a horde of demons overrunning an entire planet because of the ?

Did you know that the cacodemon is based on two monsters from ?

Did you know that Dario and Milo Casali are sons of, creator of ?

Did you know that the last remaining id Software employees from the development of Doom are an art assistant and an office manager?

Did you know that before developing Doom, id Software created a pitch demo for  on MS-DOS?

Did you know that no one knows what happened to Strife's source code?

Did you know that any monster in the Sony PlayStation and Sega Saturn versions of Doom can become a nightmare monster, but in the final version this is only applied to nightmare spectres?

Did you know that the re-release versions of Doom 64 have the option to configure nightmare monsters similarly to the PlayStation version of Doom?

Did you know that Hell knights and barons of Hell can infight normally in the Sony PlayStation and Sega Saturn versions of Doom, as well as in Doom 64?

Did you know that when playing a deathmatch in Heretic, if the player's frags fall below -9 (negative nine), then instead of a number, the inscription LAME will be shown in the status bar?

Did you know that a fan game running on the Doom engine has been in active development for over two decades?

Did you know that episodes 2 and 3 of Doom swapped places during development?

Did you know that in the press release beta, lost souls originally attacked the player through an unavoidable hitscan attack?

Did you know that id Software employee Tim Willits was contracted to make a level for a PWAD theme after a brand of soda?

Did you know that TNT: Evilution was originally meant to be a free megawad before being given to id Software for the commercial Final Doom release?

Did you know that Doom's protagonist is one of the playable characters in ?

Did you know that DQD in the "iddqd" cheat code is a reference to Delta-Q-Delta, a fictional fraternity created by Dave Taylor?

(More trivia...)